Question 1

Limbs are complete.
A) 8 weeks (end of embryonic period)
B) 9-12 weeks (month 3)
C) 13-16 weeks (month 4)
D) 17-20 weeks (month 5)
E) 21-30 weeks (months 6 and 7)

Accepted Answer

By the end of the embryonic period (8 weeks), the limbs are fully formed, marking a significant milestone in human development.

Question 2

The neural tube develops from this layer.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The neural tube is a structure that gives rise to the brain and spinal cord. It develops from the ectoderm layer during embryonic development.

Question 3

Figure 3.1
Use the diagram above to answer the following questions.
-Which letter indicates the zygote?
A) A
B) B
C) C
D) D
E) E

Accepted Answer

The zygote is formed immediately after the sperm fertilizes the egg, which is represented by letter B, indicating the earliest stage of development before cell division begins.

Question 4

The epiblast develops a primitive streak during days 14-15, the initial cells that ingress through the primitive streak become this germ layer.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The initial cells that ingress through the primitive streak during the development of the epiblast form the endoderm, which is the innermost layer of the three primary germ layers in the embryo.

Question 5

The ectoderm develops into the epithelium of the skin, whereas this layer gives rise to the epithelial lining of the gut tube.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The endoderm gives rise to the epithelial lining of the gut tube, while the ectoderm develops into the epithelium of the skin.

Question 6

This develops into the lining of the gastrointestinal tract.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The endoderm is the innermost germ layer that develops into the lining of the gastrointestinal tract and other internal organs.

Question 7

The ribs and vertebrae form from this primary germ layer.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The mesoderm-somites give rise to the ribs and vertebrae.

Question 8

Sex can be determined from the genitals.
A) 8 weeks (end of embryonic period)
B) 9-12 weeks (month 3)
C) 13-16 weeks (month 4)
D) 17-20 weeks (month 5)
E) 21-30 weeks (months 6 and 7)

Accepted Answer

The answer of Sex can be determined from the genitals.
A)...

Question 9

The mesoderm located deep to the neural tube that forms the kidneys and the gonads is the
A) endoderm.
B) ectoderm.
C) mesoderm-somites.
D) mesoderm-lateral plate.
E) intermediate mesoderm.

Accepted Answer

The mesoderm located deep to the neural tube that forms the kidneys and the gonads is the intermediate mesoderm.

Question 10

Figure 3.1
Use the diagram above to answer the following questions.
-Which letter indicates the morula?
A) A
B) B
C) C
D) D
E) E

Accepted Answer

The answer of  Figure 3.1
Use the diagram above to...

Question 11

Figure 3.1
Use the diagram above to answer the following questions.
-Which letter indicates the blastocyst?
A) A
B) B
C) C
D) D
E) E

Accepted Answer

The answer of  Figure 3.1
Use the diagram above to...

Question 12

Quickening occurs (mother feels fetus moving).
A) 8 weeks (end of embryonic period)
B) 9-12 weeks (month 3)
C) 13-16 weeks (month 4)
D) 17-20 weeks (month 5)
E) 21-30 weeks (months 6 and 7)

Accepted Answer

Quickening typically occurs between 17-20 weeks, which is during the fifth month of pregnancy.

Question 13

Mucus-producing glands of the respiratory tract arise from this layer.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The respiratory tract is lined with endoderm, which gives rise to the various glands (such as the mucus-producing glands) that are found within the respiratory epithelium.

Question 14

What embryonic epiblast cells that remain on the surface of the trilaminar disc are ultimately called.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The embryonic epiblast cells that remain on the surface of the trilaminar disc form the ectoderm.

Question 15

All major organs are present in rudimentary form.
A) 8 weeks (end of embryonic period)
B) 9-12 weeks (month 3)
C) 13-16 weeks (month 4)
D) 17-20 weeks (month 5)
E) 21-30 weeks (months 6 and 7)

Accepted Answer

The embryonic period ends at 8 weeks, at which point all major organs have formed in rudimentary form.

Answer: B, C, D, E are incorrect because they represent later stages in fetal development when the organs are already fully formed and are continuing to grow and mature.

Question 16

Figure 3.1
Use the diagram above to answer the following questions.
-Which letter indicates the oocyte?
A) A
B) B
C) C
D) D
E) E

Accepted Answer

The oocyte is the large cell labeled "A" in the diagram.

Question 17

Eyes open and lungs develop.
A) 8 weeks (end of embryonic period)
B) 9-12 weeks (month 3)
C) 13-16 weeks (month 4)
D) 17-20 weeks (month 5)
E) 21-30 weeks (months 6 and 7)

Accepted Answer

The eyes open and the lungs continue to develop significantly during the 21-30 weeks period (months 6 and 7) of fetal development.

Question 18

This develops into the brain and spinal cord.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The development of the brain and spinal cord are a result of the ectodermal layer.

Question 19

This develops into the epidermis of the skin.
A) endoderm
B) ectoderm
C) mesoderm-somites
D) mesoderm-lateral plate
E) intermediate mesoderm

Accepted Answer

The ectoderm is the outermost layer of the embryo and gives rise to the epidermis of the skin, as well as the nervous system, hair, nails, and other epithelial tissues. The endoderm develops into the lining of the digestive and respiratory tracts and associated organs. The mesoderm-somites give rise to muscle, bone, and cartilage. The mesoderm-lateral plate gives rise to the cardiovascular system, blood, and the lymphatic system. The intermediate mesoderm gives rise to the urogenital system.

Question 20

Figure 3.1
Use the diagram above to answer the following questions.
-Which letter indicates the uterus?
A) A
B) B
C) C
D) D
E) E

Accepted Answer

The answer of  Figure 3.1
Use the diagram above to...

Quiz 3: Basic Embryology

Limbs are complete.

The neural tube develops from this layer.

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the zygote?

The epiblast develops a primitive streak during days 14-15, the initial cells that ingress through the primitive streak become this germ layer.

The ectoderm develops into the epithelium of the skin, whereas this layer gives rise to the epithelial lining of the gut tube.

This develops into the lining of the gastrointestinal tract.

The ribs and vertebrae form from this primary germ layer.

Sex can be determined from the genitals.

The mesoderm located deep to the neural tube that forms the kidneys and the gonads is the

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the morula?

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the blastocyst?

Quickening occurs (mother feels fetus moving) .

Mucus-producing glands of the respiratory tract arise from this layer.

What embryonic epiblast cells that remain on the surface of the trilaminar disc are ultimately called.

All major organs are present in rudimentary form.

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the oocyte?

Eyes open and lungs develop.

This develops into the brain and spinal cord.

This develops into the epidermis of the skin.

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the uterus?